Electrical discharge tube circuits



Oct. 19, 1948. p, 2,451,910

ELECTRICAL DISCHARGE TUBE CIRCUITS Filed July 28, 1945 m .L I 7 1 2/ 7 QI;J

WITNESSES: I I INVENTOR z Z Aslzieyffiocfi.

77 4 W BY ATTORN Y 6 and I4 through tube I.

shunt capacitanc between them additional to the capacitanc l6, l1, |8, I9, and through this additional capacitance, together with the inductance of the lines 6, 9 and I4, parasitic currents may be generated and flow through the tube I, thereby causing substantial energy losses and other undesirable effects,

In accordance with my invention, I subdivide the total capacitance for the tank circuit above mentioned into a major portion and a minor portion, the major portion being located closely adj a-.- cent the inductance I, and a minor portion comprising a separate capacitor 2|, I connect in parallel with the remainder of the capacitance l6, l1, l8, |9,'but at the end of the transmission lines 6 and I4 which is closely adjacent the generator tube To take a specific example, the capacitance 2| may be one-fifth of the total capacitance to be connected into an anti-resonant circuit with the inductance to produce the desired frequency of alternating current to be supplied to the load 4. In the arrangement shown in the drawing, for example, the capacitances l6, l1, l8, l9 and 2| might all be equal to each other, in which case one-fifth of the total capacitance which would resonate-with the inductance I would be connect- ,ed at the point 2| adjacent the generator tube I.

The capacitance 2| will, in installations of any substantial size, be large compared with the mutual distributed capacitance of the lines 6, 9, M and will, in fact, act substantially as a short-circuit across the tube for any parasitic currents whichmight otherwise tend to flow through the distributed capacitance and inductance of lines In this way, the flow of such parasitic currents in the tube is so minimized as to be substantially eliminated.

It would, of course, be equally possible to minimize the parasitic currents through the tube I due to the distributed capacitance and inductance in the transmission lines 6, 9 and M by positioning the capacitances l6, l1, I8 and IS (in other words, the entire capacitance of the anti-resonant circuit) at the same end of the transmission lines 6 and M as the capacitance 2| is shown in the drawing. If this were done, the transmission lines 6 and I4 would have to carry the entire current of the tankv circuit, n the other hand,

while a portion of the tank circuit current generated and flowin through the inductance 1 passes through the capacitance 2| by way of the transmission lines 6 and I4, in the arrangement shown inthe drawing herein, this is a relatively small fraction (in the example just given, one-fifth) of the total tank circuit current, so that the transmission lines 6 and M are not required to carry anything like the entire tank circuit current.

By transferring a minor fraction of the tank circuit capacitance from the load end of the transmission line to the generator-tube end, I have provided an arrangement in which parasitic currents are eliminated without greatly increasing the cost of the apparatus or the required current-carrying capacity of the transmissionlinesB and I4.

While I have described a specific embodiment of the principles of my invention, it will be evident to those skilled in the art that these principles are capable of broader application in many obvious ways.

I claim as my invention:

1. In combination with an electrical discharge tube and a tank circuit having elements which it is desirable to locate at a substantial distance therefrom, a transmission line having a first end connected to exchange power with said discharge tube and its other end connected to a tank circuit comprising an inductance shunted by a P rtion of the capacitance required to resonate with said inductance at a desired frequency, the remainder of the capacitance required to resonate with said inductance at the required frequency being positioned adjacent said first end of said transmission line.

2. In a system for supplying alternating currents to a load, a grid-controlled electricaldisch'arge tube positioned remote from said load, a transmission line connected at its first end to said discharge tube and connected at its second end to an inductance located nearer said load and shunted by a capacitance to constitute an antiresonant circuit, and an additional capacitance shunted across said transmission line at said first end thereof. I

3. In a system for supplying alternating current of a desired frequency to a load, a, grid-controlled electrical discharge tube connected to the first end of a transmission line, the other end of said transmission line being connected to an inductance, capacitance of sufficient size to resonate with said inductance at said desired frequency,a major portion of said capacitance being located in close proximity to said inductance, and a minor portion of said capacitance being located at said first end of said transmission line.

4. In a system for supplying alternating current of a desired frequency toa load, an electrical discharge tube having a control-electrode connected to the first end of a transmission line, the

' other end of said transmission line being con- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,135,672 Morris et a1 Nov. 8, 1938 2,368,052

Unger Jan. 23, 1945 

